COMPRESSOR (See page AC-22) ON-VEHICLE INSPECTION 1. INSTALL MANIFOLD GAUGE SET (a) Close the HI and LO hand valves. (b) Connect the high pressure hose to the discharge service valve of the compressor. (c) Connect the low pressure hose to the suction service valve of the compressor. 2. RUN ENGINE AT FAST IDLE 3. CHECK COMPRESSOR FOR FOLLOWING: (a) High pressure gauge reading not low and low pressure gauge reading is not higher than normal. (b) Metallic sound (c) Leakage from the shaft seal If defects are found, repair the compressor. 4. CHECK MAGNETIC CLUTCH (a) Inspect the pressure plate and the rotor for signs of oil. (b) Check the clutch bearings for noise and grease leakage. (c) Using an ohmmeter, measure the resistance of the stator coil between the clutch lead wire and ground. If the resistance is not within tolerance, replace the coil. Standard resistance: 3.7 ± 0.2 Ω at 20°C (68°F)